Website Monitoring Tools

Free, open-source utility for network security auditing and exploration with capabilities for OS detection, service identification, and large network scans.

Open-source, cross-platform network scanner for fast, simple IP and port scanning. Lightweight with no installation needed, extensible via plugins.

SimilarWeb is a global software development and data aggregation company specializing in web analytics and digital performance. It provides traffic insights for websites, supporting market research, competitive analysis, and business development.

Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc. Zenmap aims to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users.

changedetection.io - The best and simplest self-hosted free open source website change detection monitoring and notification service. An alternative to Visualping, Watchtower etc. Designed for simplicity - the main goal is to simply monitor which websites had a text change for...

Wappalyzer is a technographics data provider, uncovering technologies such as content management systems, customer relationship management, ecommerce platforms, advertising networks, marketing tools and analytics.

Unified analytics and uptime platform, optimized for casual users with a streamlined, deploy-anywhere approach.

Website monitoring with alerts via calls, texts, and more. Includes on-call scheduling, calendar sync, incidents timeline, and status page sharing.

Netdata collects metrics per second and presents them in beautiful low-latency dashboards. It is designed to run on all of your physical and virtual servers, cloud deployments, Kubernetes clusters, and edge/IoT devices, to monitor your systems, containers, and applications.

Advanced self-hosted tool for tracking uptime across multiple services with reactive UX, interval checks, various notifications, and multi-language support.

Prisme Analytics is an Open Source, privacy-focused and progressive analytics service.

Monitor up to 50 sites with 5-minute intervals for free. Receive alerts by email, SMS, calls, and integrate with platforms for seamless updates.

Wafris is the open-source Web Application Firewall that works with your web framework to protect your sites from dark traffic, intrusions, and attacks.

Distill is a web monitoring tool. It can monitor RSS feeds, a webpage or a part of webpage. Alerts in the form of pop-up, audio or emails can be received.

GlitchTip's open source platform makes monitoring software easy. Track errors, monitor performance, check site uptime all in one place. Compatible with Sentry client SDK but easier to run and entirely open source.